paracyanogenn.

Brit.

/ˌparəsʌɪˈanədʒ(ə)n/, U.S.

/ˈˌpɛrəˌsaɪˈænədʒ(ə)n/,

/ˈˌpɛrəˌsaɪˈænəˌdʒɛn/

Origin: Formed within English, by derivation. Etymons: para- prefix¹, cyanogen n.

Etymology: < para- prefix¹ + cyanogen n. Compare French paracyanogène (1848 or earlier), and also German Paracyan, in sense ‘paracyanogen’ (J. J. Johnstone 1837, in Ann. der Pharm. 22 280).

Chemistry.

A solid polymer of cyanogen formed in small quantities when cyanogen is prepared, e.g. by heating mercury( ii) cyanide.

ΘΚΠ

the world > matter > chemistry > organic chemistry > organic radicals > [noun] > radical compounds (general) > radical compounds (named)

paracyanogen1844

nitrile1848

adiponitrile1902

tris1976

1844 G. Fownes Man. Elem. Chem. iv. 449 Paracyanogen.—This is the brown or blackish substance..which is always formed in small quantity when cyanogen is prepared by heating the cyanide of mercury.

1864 H. Spencer Princ. Biol. I. 7 In paracyanogen, formed of the same proportions of these elements in higher multiples, we have a solid which does not fuse or volatilize at ordinary temperatures.

1906 H. J. H. Fenton Notes Qualitative Anal. (new ed.) 38 On heating, it [sc. silver nitrate] decomposes into metallic silver, cyanogen, and paracyanogen.

1988 F. A. Cotton & G. Wilkinson Adv. Inorg. Chem. (ed. 5) viii. 248 Impure (CN)₂ can polymerize on heating to give a polymer, paracyanogen, which will depolymerize above ≃850°C. Interaction of KCN and ICN gives a linear paracyanogen.

This entry has been updated (OED Third Edition, June 2005; most recently modified version published online March 2022).

单词	paracyanogen
释义	paracyanogenn. Brit. /ˌparəsʌɪˈanədʒ(ə)n/, U.S. /ˈˌpɛrəˌsaɪˈænədʒ(ə)n/, /ˈˌpɛrəˌsaɪˈænəˌdʒɛn/ Origin: Formed within English, by derivation. Etymons: para- prefix¹, cyanogen n. Etymology: < para- prefix¹ + cyanogen n. Compare French paracyanogène (1848 or earlier), and also German Paracyan, in sense ‘paracyanogen’ (J. J. Johnstone 1837, in Ann. der Pharm. 22 280). Chemistry. A solid polymer of cyanogen formed in small quantities when cyanogen is prepared, e.g. by heating mercury( ii) cyanide. ΘΚΠ the world > matter > chemistry > organic chemistry > organic radicals > [noun] > radical compounds (general) > radical compounds (named) paracyanogen1844 nitrile1848 adiponitrile1902 tris1976 1844 G. Fownes Man. Elem. Chem. iv. 449 Paracyanogen.—This is the brown or blackish substance..which is always formed in small quantity when cyanogen is prepared by heating the cyanide of mercury. 1864 H. Spencer Princ. Biol. I. 7 In paracyanogen, formed of the same proportions of these elements in higher multiples, we have a solid which does not fuse or volatilize at ordinary temperatures. 1906 H. J. H. Fenton Notes Qualitative Anal. (new ed.) 38 On heating, it [sc. silver nitrate] decomposes into metallic silver, cyanogen, and paracyanogen. 1988 F. A. Cotton & G. Wilkinson Adv. Inorg. Chem. (ed. 5) viii. 248 Impure (CN)₂ can polymerize on heating to give a polymer, paracyanogen, which will depolymerize above ≃850°C. Interaction of KCN and ICN gives a linear paracyanogen. This entry has been updated (OED Third Edition, June 2005; most recently modified version published online March 2022). < n.1844
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